This term was established in the movie "The Other Guys"
Hobo#2-"Yea! Ellen left her prius in the strip club parking lot this afternoon. Me and the boys had a nasty soup kitchen in it and we wrecked it. We were suckin down on farts...outrageous fun."
Hobo #1-"No way! Wish i could have been there!"
Will Ferrell: Great.
*Police Radio*: It was literally giving a hummer to a hummer.
Will Ferrell: You find anything?
Police Investigator: Yeah, we found a lot of stuff. Bodily fluid and hair samples, we determine a bunch of old homeless dudes had an orgy in the car.
Will Ferrell: Oh god.
Police Investigator: Yeah, you know what's that called when they do that in there? It's called a Soup Kitchen. It's a pretty rough stuff. Not long after that, a mama raccoon came along and *sniff* gave birth on the floor. Found a deer vagina.
Will Ferrell: Awww, what?!
Police Investigator: That could've just been there from before though. We thought it was human lips at first. I've never seen so many fluids.
Some times leaving behind items like new born babies and/or dead mice in used condoms.
Jim: GOD DAMN IT THOSE HOBOS HAD ANOTHER SOUP KITCHEN IN MY PRIUS.